A: When you create a new email you can add contacts on copy or hidden copy.
If you want to add many contacts on copy and don't want to add them one by one, you can pick the contacts you want to email in your contact list and click on Send email in the menu that appears at the bottom of the page. This will send the email to the contacts as hidden copy, they won't see that it's been sent to other contacts. You can send an email with maximum 100 contacts on copy, if you want to send to more, use email campaigns.